Why more boys are born than girls? – AD.nl

Edited by: Editorial
31-3-15 – 02:24 Source: Reuters, AP © getty.

That every year, slightly more boys than girls are born, was already known. Now it seems that the ratio between the number of boys and girls during pregnancy changes.

Many experts assumed that at fertilization boys already had an advantage, but that is not the case. According to researchers at the scientific institute Fresh Pond in Cambridge is the ratio still equal. Only during pregnancy die eventually more girls than boys.

The British and American researchers used data on miscarriages, abortions and embryos from artificial insemination. Also, amniocentesis and chromosomal analysis yielded information.

In the first week after conception would allow more male embryos life, appears from the research published today. From the tenth to the fifteenth week but go more female unborn dead. By the end of the pregnancy die once again more boys than girls.

Overall survival slightly more male than female embryos pregnancy.